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Vitamin A is a group of unsaturated nutritional organic compounds, that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids, and beta-carotene.

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Attack on titan A\ Snk Shingeki no kyojin Titan Christa Ymir

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"As a professor of science, I assure you we did, in fact, evolve from filthy monkey-men."
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